ramips: increase spi-max-frequency for ipTIME mt7620 devices

This commit increases the hardware SPI frequency from 24.2MHz to 48.3MHz.

[    5.314163] m25p80 spi0.0: speed: 24166666/40000000, rate: 8, prescal: 2, loops: 226
[    5.076323] m25p80 spi0.0: speed: 48333333/50000000, rate: 4, prescal: 1, loops: 162

`time cat /dev/mtd2 >/dev/null` is reduced from 5.64s to 4.36s on A104ns,
and from 11.39s to 8.81s on A1004ns.

Signed-off-by: Sungbo Eo <mans0n@gorani.run>

diff --git a/target/linux/ramips/dts/mt7620a_iptime.dtsi b/target/linux/ramips/dts/mt7620a_iptime.dtsi
index 5a6fdacb52977c95d3201decd6fd456945b9b750..c7c90ca722c9ce403ac0e7c55ecfcaa860e695fe 100644 (file)
--- a/target/linux/ramips/dts/mt7620a_iptime.dtsi
+++ b/target/linux/ramips/dts/mt7620a_iptime.dtsi
@@ -21,7 +21,7 @@
        flash@0 {
                compatible = "jedec,spi-nor";
                reg = <0>;
-               spi-max-frequency = <40000000>;
+               spi-max-frequency = <50000000>;
 
                partitions {
                        compatible = "fixed-partitions";